I can't speak to the CEA locations or their distance, but we have locations that are within 30 minutes of driving time and you would be surprised at how little cross-town competition there is for athletes. There are a few who will switch, but that number is less than you would expect.
Within most relatively large metropolitan areas, parents are often not excited to drive very far or go past geographic "hurdles" like a particular major highway. In our Plano location, we have had people who flew in, drove hours each way, etc. from WAY out of town, but rarely have athletes from the opposite side of town.